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- čas přidán 8. 07. 2024
- A basic introduction to the Field Effect Transistor (FET). This includes a basic description of the Junction FET (JFET) and the Metal Oxide FET (MOSFET), and also discusses N-Channel vs. P-Channel, as well as Depletion Mode and Enhancement Mode type devices. The function of the Gate, Source and Drain terminals are reviewed. The linear region and saturation region of operation of the devices is described and demonstrated. In a short video like this, it is impossible to get into depth in any application - the intent with this video is to lay the foundation of the operation of the FET and to make sense of the various terminology surrounding the different types of devices. The notes from this video can be found here:
www.qsl.net/w2aew/youtube/Intr... - Věda a technologie
After 6 years still the best intro to FETs on youtube, thank you!
I'll have to agree. After putting this together and following along with a scope, I finally get it. Thanks a lot Alan!
The value of your electronics knowledge is exceeded by your skills in communication. Years ago I rushed through a college EE absorbing everything but not truly grokking it. Now I have the leisure of enjoying the craft and your videos are just a pleasure to consume like a fine meal. There are few CZcamsrs with these communication skills and it would be valuable in the long term for your videos to not only be stored on this one platform. Links break and platforms die, I hope these videos will survive - for the future generations (the ones who will have to repair all the old FET technology handed down to them)
I also enjoy the comments section - high quality Q&A after the lecture, smart audience questions
Everything you do is amazing.
+Afrotechmods your videos are pretty good too!
+Afrotechmods Thank you! I love your videos too - great stuff!
we miss you man hope to hear from you soon!
Same with you. :>
@Afrotechmods respect to you too!
I just love your tutorials! Your drawings are so well thought out and drawn. I'm a 73 yr old mining engineer who couldn't get enough electronics in college, but we barely had transistors then. I will probably ask ignorant questions, but about much of this information I am ignorant. Thanks so much for what you do!
In 20 minutes you managed to explain what my electronics teacher taught in 2-3 months of classes. Truly great refresher video for me. Thank you.
After more than 3 years, I keep watching and rewatching this video. Brilliant!
Hands down, this is the best explanation of basic FET operation that I've ever heard and I have a PhD in analog circuit design! Great great video. Made my day that this is available.
Thank you very much for comments - it means a lot coming from someone with your education! I have just a BSEE myself...
You are welcome. Your presentation was very clear, you used the correct terms (like carrier), your demonstration verified your explanation. Just great. BTW, my advisor was this guy, www.aicdesign.org/, he wrote the 'Red Book'. Well that's what they called his CMOS book in the late 80s.
I'm now poking around to see what you cover. Have a great day!
I have the "red book", nice companion to the "blue book" (Grey & Meyer). To make it easier to find videos on my channel, I maintain a complete index that is arranged numerically and by topic. It's a PDF, so you can search it, and each video is linked. Here is a link to the file that I keep up to date:
www.dorkage.com/youtube/W2AEW_video_index.pdf
w2aew yes, we all had the blue book as well. The Georgia Tech analog design group was little biased towards the red book, seeing that we could easily consult with author.
Dr Allen and I are working on a vacuum tube design course right now. I'll be sure to reference this video as a preliminary FET refresher. JFETs are just like triodes, kind of thing.
I'm looking at your index pdf right now. Thanks
Your the man to look? -up to. THANKS
Very well explained and quite thorough. It is difficult to pull the characteristics of different devices together, but you did that very well. The only thing you may have left out was a detail about the physical model of a junction FET. Just like the MOSFET, a junction FET has a capacitor across the channel because the substrate is connected to the Source. The gate has a wider geometry than what you showed; at least according to Siliconix literature. The electric field inside this capacitor causes free carriers to migrate away from the channel region near the source and drain, creating depletion regions.
One of the best teachers on here! Listen to this guy. Lots. Thank you so much for your time. 73's
FINALLY! A clear & comprehensive presentation on Field Effect Transistors. I've been struggling to get a foothold/foundational understanding of these for years. While I've known there is a difference between JFETs & MOSFETs, I couldn't distinguish or get clarification on the subtle nuances of the different types.
You Sir, are a modern day Forrest Mims. THANK YOU!
Wow - that's quite a complement - I learned so much from his Engineer's Notebook books from Radio Shack in the late 70s.
I know that this is somewhat arbitrary for most advanced people but for new guys it is very, very useful to see in what applications devices are used.
First step of learning - replicate: try to mimic ones work step-by-step, all of it.
Second - duplicate: try to make ones device without copying it, but by using ideas You got from set above.
Third - upgrade: try to make ones device better.
Forth and final: create: make Your own device!
See, telling about transistors, FETs and all the other good stuff You're telling, is like fulfilling second to forth steps...
Examples are awesome - all the measuring circuits, test circuits etc. Because they fill in gaps for fist step.
... what I am trying to say is ... more fist step! :D :D
But great job, really... thumbs up! :)
I love that the multimeter in the thumbnail reads 4007, which is the name of a CMOS transistor array. Thank you for the video, it was very helpful!
Hmmm, was that a "planned" easter egg???? We'll never know ;-)
Your style of explaining electronics is black magic and you are a wizard of teaching.
Thank you for your efforts to light up our minds.
You are really a good tutor, teacher and presenter. We can appreciate this even more now during this pandemics, since many of us teachers are having to prepare video-lectures. This may look easy to do for the one watching. One clear indication of your talent is your fluency. Your videos have little cuts, usually related to change of settings/equipment, no cuts related to your text. You make it very simple and practical, no fancy boards or "special effects".Yet the content is quite clear and objective. I have been teaching Physics at the university for many years now. I believe your channel, including the pdf index, should be set as one of our world resources, since your style (direct to the point) is very useful for kids in technical schools and engineering students. Congratulations.
Thank you - please feel free to share my content with your students.
At 67 years old I have just started trying to teach myself electronics and have found your videos informative, consise & interesting! Your description of real life applications of the various components is very useful! Thank you for your excellent presentation!
I'll thumbs-up every Back to Basics video. So useful when you want to understand electronics
I learn more in your videos than I did in some classrooms. You're channel is incredible!👍😀
This is the clearest explanation of the "FET family tree" I've found. My brain hurt trying to read the descriptions in textbooks. I love that current mirror trick for watching the current without disturbing the DUT.
Best video on explaining FETs on CZcams. I really appreciate your pace and paper and pencil explanations coupled with a scope demo. All your "back to basics" videos are superbly done. Thanks!
Thank you. I've been thinking about doing a similar one for Bipolar transistors (BJTs) too.
Excellent intro to FETs. Really made the operation understandable, thanks!
This is the most educational channel I've seen. You have an excellent way of describing and explaining every concept. I wish I had found this channel earlier, I would be a much better engineer today. Thank you and keep up the good work!
Hard to find good quality content about electronics on CZcams. So I'm saving this to a playlist. This is good stuff, thanks.
You are the best electronics teacher!!! I'm very happy I've found your youtube channel! Though I'm quite experienced in electronics I have a lot to learn from you.
You are the best electronics teacher on the internet in my opinion! Thank you so much for putting these videos out there. These are priceless for electronic students!
As a newbie to electronics, I have to thank you. Learning a lot from your videos. So you have a very grateful fan! Thanks again!
I loved this video, very well explained, relly professional, shows exactly what a engineer or tech needs to know in a delightful structured master class, thanks a bunch !!
Succinct and clear, great introduction video, thank you!
What a great explanation! The best I've heard yet. Detailed, concise, and very informative.
I can't like your video enough. Amazing walk-through for basic FET knowledge!
You have a good way of explaining the electronic topics that you present on these videos.
Thanks so much.
Incredibly clear presentation. Thank you so much for sharing your knowledge!
Thanks! You are an excellent teacher. With your discussion of complex topics such as this, and then your hands on demonstration, I can always learn something. 73
I learned this theory years ago, and admittedly haven't used it much since. Soaking in your excellent tutorial on the topic is very much akin to meeting an old friend that I haven't seen in years. Super good stuff! Thank you! 73, N6MKC.
Thank you so much for taking time to make those videos. The quality of the explanations is amazing and the simple circuits that illustrate theory help a lot. Please keep up sharing your experience of analog electronics.
Very well thought out and presented tutorial. Thankyou Alan. In one video you have managed to explain characteristics that took our teachers numerous lectures which still left me confused.
Your video nailed the concepts and differences concisely and simply.
Best introduction on FETs that i've seen so far. Thanks a lot!
I have spent the last 30 years as an analog circuit designer. I just found your videos a few days ago. You have rekindled my interest in poking around in the lab. I love the hands-on nature of your videos. I have fallen into the trap of reading papers instead of independent verification as you do. Thanks for the inspiration. I subscribed, and am now watching your other videos. By the way, the family tree of FETs is a great way for me to remember things. Great stuff. As a side note, I too love hand written notes. I work for Caltech, and a bunch of us have fallen in love with an electronic note-taking tool called Good Notes. We use it with the Apple Pencil on iPads. Some of us teach entire classes now with the hand written notes. There's something soothing about it for both the students, and the teacher. It's great for designing circuits and not getting bogged down in a CAD package...
So glad to hear I've inspired you to get back on the bench! I'm a big fan of "where the rubber meets the road". Keep in mind that I maintain an index to all of my videos to make it easy to search for topics you may be interested in. It is arranged numerically as well as roughly by topic:
www.qsl.net/w2aew/youtube/W2AEW_video_index.pdf
Thanks for the tip on Good Notes, I'll check it out. Lately, I've been using a ePaper tablet for my hand-written notes. It has the same sound/feel as pencil on paper. The one that I use is from www.remarkable.com.
Also, please feel free to share any of my videos with your students - maybe we can inspire them together!
Another great vid. Back to basics are some of my favorites! Thanks for all the hard work you put into these.
I've finished two years at university studying electronics and really not understanding how FETs work, its unreal. Thanks for this video. PS just found your channel today and am binge watching all your video lol :)
This is probably my 10th time watching this video to gasp in depth understanding of transistors in general. Your Back to Basics series are top notch and no other youtubers explains it to this degree. Thank you for taking the time put up these in-depth class-room feel videos! P.S don't ever lose the paper and pen(cil) way of teaching
Unreal, so glad I found you. An electronics instruction at a click of a mouse button. Thank you so much for your work and videos!
+JD Dupuy Glad you like the channel. Don't forget about the Table of Content / Video Index file (PDF) that is linked in the lower right corner of the channel's main graphic banner. And, be sure to let me know if there is a topic you'd like to see in the future.
Super clear explanations. Love the family tree. For somebody like me still figuring out what goes for what, it saved me alot of research. Thank you. Much appreciated
Your Back to basic videos are fantastic. Thanks Alan.
fantastic as ever. in fact it was my first to see the graphs on the oscilloscope. i always sow them in the books. thanks again.
You are psychic ... I was just reading up on JFETs when you uploaded this. Good job!
The best explained videos I've seen thus far on youtube, thank you so much !
Very good explanation. You've made it very plain and simple for electrical?electronics technicians and engineers to understand. Good job, keep it up.
Now I understand it!! Great illustrations and an easy-to-follow video!! Thanks for sharing!!! ☺
you are an amazing explainer ...i am learning from you and simulating side by side. totally new level of understanding. thank you.
Great instructional video with examples! Fantastic.
So very clearly explained. You are a great teacher. Thank you for this great material!
Another great back to basic video Alan.Easy to follow, Well Done. Thumbs up.
*Very thorough and carefully presented. Thank you - this has helped me enormously.*
Beautifully made tutorial thank you.
It interests me as a restorer of vintage stuff to note that the Jfet biasing is just like a vaccuum tube cathode bias method.
Brilliant video! Thank you. Excellent, logically, well paced, clear. Good work!
The ARRL should footnote and have links to many of your videos in the General and especially the Extra Class manuals. You have been such a great help to me in understanding such difficult topics as you cover. Thanks so much!!
razor-sharp explanation, so much appreciated
You explain all this stuff as master. Thank for your knowledge
Pure Gold Explanation ! Thank you !
Thank you. I am going to have to keep coming back to this video.
Its always very informative to watch all of your video.
You sir, are doing God's work.
So glad I found this channel...!
Superb tutorial, best online source of information. Thanks for the uploads, please keep the great work.
Great tutorial. I've said it before, you're an excellent teacher.
The best electronics tutorial video. Thank you for sharing.
As always an excellently presented video. Thank you.
Although it just an introduction to JFETs and MOSFETs its a great video. I always enjoy your videos. Nice work!!
You are doing a great job ... I'm learning a lot here ... Much better then school... Carry on
Very nice video with very good explainations and very clear diagrams. Keep up the great work.
Thank you for a well done FET review!!! Well done.
Fantastic refresher! I've been away from electronics projects for a while but this video actually answered some questions I had a long time ago.
I have to say that I laugh from amazement when I see how organized and diligently structured these lessons are. Master of details. Someday hopefully I will be more like this.
+swiftjeff The organization and structure to this lesson is due to several hours of noodling on various ideas, and countless notes, research, etc., to assemble just the right combination of information and narrative - followed by a few hours of shooting clips, editing and finally posting on CZcams.
+w2aew Thanks for that insight into what goes into the videos! It provides a different perspective on the many hours I've put into projects, perhaps not as wasted as I have thought.
Very nice video, explanation and demonstration. I really enjoy how you stay on point through all your lessons. I wish I'd have had instructors like you when I was in my engineering courses. Thanks & 73 de kb4twn
one of the most informative vids i seen. well at least for me, as concerning mosfet's and cb radio's in final p/a transistor flow chart applications. i hope that isn't confusing. it makes sense to me, and i had to read it several times.
Really great and easy explained, especially using measurement of I-V curve is very understandable!! Thanks.
Great video. This is sort of a review of the things I learned, and mostly have forgotten, from my BSEE degree back in the "dark ages" (1976). What I was trying to remember was when to use a JFET and when to use a MOSFET. Most of the videos are on MOSFET technology. 73 de AF6AS.
Brilliantly explained
Thank you! Best wishes from Lithuania!
Another excellent video! Thanks for spending the time to make these. I always learn alot.
your videos are amazing , full of practical issues .... thanks
Great introduction to FET, Thank you!
very nice and detail explanation. Never knew the important details about mosfets and jfets
You make things look and make sense to all that view. pity I didn't have you as a teacher back in the day.
Cheers
kudos Dear w2aew for your edification
Well done. New to electronics , fascinating . Thanks
What a great introduction!
Tremendous presentation. Thank you. 👍
Thanks for the explanation and bench demo.
Super. And your papers are works of art.
You made my day volke !
Thank you for these videos! You're golden.
Its very difficult for those of us with learning disabilities to translate acronym speak on the fly. Its like running on a track trying to keep up but every other step there is a concrete block to be negotiated. Yes, I can clearly see what the acronym stands for, but I have to turn the letters into words then input it into my broken processor. Video is great and undoubtedly easy to understand for 90% of the audience.
Nice job on this. The comparison is very useful
Nice video, the way and steps you taked are profesionnal thank you
Great presentation. Very helpful.
You should definitely bind those notes to form a book like forrest mims :)
Need more videos on back to basics. A lot of people will be benefited Thank you for sharing :)
excellent teaching
Thanks, Alan. Great video.
@20:70 i think you mixed between when to use it as a switch and when as an amp, because we drive the device to saturation when we need it as a switch not the opposite ... you are amazing mr alan .. so happy i found you
There is an unfortunate difference between the terminology used for a bipolar transistor's saturation region and a FET's saturation region - they are opposite! For a bipolar transistor - operation as a switch (very low Vce) is the saturation region. But, for a FET, the switch operation (very low Vds) is called the linear or ohmic region. The FET's saturation region is when operating in linear/amplifier applications - the same region that a bipolar calls the active region. It is unfortunate the these two device type use the same name for different regions of operation.
en.wikipedia.org/wiki/MOSFET#/media/File:IvsV_mosfet.svg
Awesome... You are the best teacher... My humble request to you would be to write a basic electronics book emphasising the practical aspects of the circuits in a very lucid way as presented in your videos.